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OSPF. Unsolicited /32 pre...

OSPF. Unsolicited /32 prefixes on directly connected interfaces

Created: Feb 19, 2019 09:42:55Latest reply: Feb 22, 2019 02:18:26 387 3 0 0

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HI here!

I'm configuring OSPF on my s6720 switch. It works, but it looks strange. I just turned OSPF on the interface, like this:

ospf 1 router-id 10.8.0.100

silent-interface all

undo silent-interface Vlanif4010

area 0.0.0.0

network 10.8.3.0 0.0.0.255

interface Vlanif4010

ip address 10.8.3.18 255.255.255.0

ospf cost 100

ospf network-type p2mp

ospf dr-priority 0

mpls

mpls ldp

As you can see, all the neigbours have addresses in 10.8.3.0/24 network.

Then it started to discover the neighbours, and exchanged the routing info. Finally I checked my RIB and found a lot of prefixes like this: 10.8.3.XX/32

Why the OSPF process generates /32 for directly connected interface. It isn't a Loopback interface, just usual vlan with broadcast network there.

I tried to change network type, but it didn't change the behaviour. Probaly it could be connected with MPLS on the interface, who knows?

Any way, could you give me a hint how i could change this behaviour? I applied a prefix list to filter these prefixes, but I don't think this is a good resolution of the problem.

x
convention：

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Scott_Qing Created Feb 21, 2019 06:26:13

in p2mp network, ospf will create a host route for each neighbor, that is what you said 10.8.3.x/32 routes.

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All Answers

sim_157 Created Feb 20, 2019 06:48:41

can you provide more details about your network topology and the routing-table?

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Scott_Qing Created Feb 21, 2019 06:26:13

in p2mp network, ospf will create a host route for each neighbor, that is what you said 10.8.3.x/32 routes.

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x
convention：

chenhui Admin Created Feb 22, 2019 02:18:26

as @Scott_Qing said, in p2mp network, ospf will generate host routes for ospf neighbors,

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convention：

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